Parallels Desktop problem with Big Sur (solution is to remove kernel extensions)

Hi,

I have had Parallels Desktop for quite some time so that I can run some Windows based software on my Mac. However, after upgrading to Big Sur a notification that says "'To start the virtual machine, please restart your Mac first.'" appears on attempt to start a virtual machine.

I went to Parallels Support KB and found this solution:

1. Remove all third-party kernel extensions from the /Library/Extensions/ folder.

2. Click OK in the notification from macOS about kernel extensions.

3. Go to System Preferences > Security & Privacy > General, then click Allow button and enable (re-enable) Parallels International GmbH kernel extension.

4. Restart the Mac and start Parallels Desktop and virtual machine again.

How exactly do I "Remove all third-party kernel extensions from the /Library/Extensions/ folder."? From what I've read, it's not as easy as dragging those files to the trash.

I have a 13-inch MBP Retina, Early 2015 running Big Sur 11.1

Thank you for your help.